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Lijing Zhou, David L. Creech, Ken W. Krauss, Yin Yunlong, and David L. Kulhavy

study, we have accepted the nomenclature that combines all Taxodium associates into one species with three botanical varieties ( Arnold and Denny, 2007 ), as follows: Taxodium distichum var. distichum (L.) Rich (BC); Taxodium distichum var

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Geoffrey C. Denny, Michael A. Arnold, and Wayne A. Mackay

nice form ( Arnold, 2002 ; Cox and Leslie, 1988 ). Two varieties, T. distichum var. distichum (baldcypress) and T. distichum var. imbricarium (Nutt.) Croom (pondcypress), have good fall color in some areas, whereas T. distichum var. mexicana

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Geoffrey C. Denny and Michael A. Arnold

Cupressus disticha . Richard (1810) transferred to the genus Taxodium as T. distichum . The correct botanical name for baldcypress is T. distichum var. distichum when the genus is treated as one species with three botanical varieties. Pondcypress is

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Garry Vernon McDonald, Geoffrey C. Denny, Michael A. Arnold, Donita L. Bryan, and Larry Barnes

. Currently, there are three recognized botanical varieties of taxodium, including Taxodium distichum var. distichum with a wide North America geographical distribution, T . distichum var. mexicanum , which is restricted to Mexico and south Texas with

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D. Creech and Yin Yunlong

There are three botanical varieties associated with the genus Taxodium: 1) Baldcypress (BC) = Taxodium distichum (L.) Rich.var. distichum, 2) Pondcypress (PC) = T. distichum var. imbricarium (Nutt.) Croom and 3) Montezuma cypress (MC) = T. distichum var. mexicana Gordon. Taxodium hybridization promises to combine the best characteristics of superior parents. In 1988, clones T302 (a BC × MC F1 hybrid), T401 (PC × MC), and T202 (PC × BC) were selected in China primarily for growth rate and tolerance to alkaline and salt-rich coastal floodplains. T302 is recommended in China for soils with pH 8.0∼8.5 and salt concentrations <0.2%. Other attributes of T302 included 159% faster growth than BC, good columnar form, longer foliage retention in fall and early winter, and no knees. T302 has been in the USA since January 2002 and is currently under evaluation in over 30 locations in southern USA. The clone was named `Nanjing Beauty' in 2004 as a cooperative introduction of the SFA Mast Arboretum and Nanjing Botanical Garden. In March 2005, the SFA Mast Arboretum received two new clones from China. T140 and T27 are considered more evergreen than T302 and both demonstrate strong salt tolerance. The clones were selected from a field population of T302 × TM—with strong TM characteristics and improvements in growth rate, salt tolerance, form and vigor. T140 grows faster than T27, which produces a wider profile. The foundation of the most recent selections comes originally from crosses made by Professor Chen and Liu in 1992 at the Nanjing Botanical Garden. Pollen from TM was applied to a female T302 and fifteen selections were made in 1995. The main characteristics for selection were 1) fast growth rate, 2) dark green color during the growing season and a red-orange leaf color in the fall, and 3) evergreen leaves. In 2006 or 2007, the results from T140 and T27 will be reported and registered with the Chinese Forestry Department. It will be at least five years before T140 and T27 enter commerce. In June, 2005 there were <100 each of these two clones. T118, T120 and T149 have already been registered with the Chinese Forestry Department at the provincial level, while T302 has been registered at the national level.

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Andrew R. King, Michael A. Arnold, Douglas F. Welsh, and W. Todd Watson

( Arnold, 2008 ; Dirr, 2009 ). The genus Taxodium Rich. includes three different varieties: baldcypress [ Taxodium distichum (L.) Rich. var. distichum ], pondcypress [ Taxodium distichum var. imbricarium (Nutt.) Croom], and Montezuma cypress

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Qin Shi, Yunlong Yin, Zhiquan Wang, Wencai Fan, and Jianfeng Hua

distichum (L.), Taxodium ascendens , Taxodium mucronatum ( Tsumura et al., 1999 ). However, recent nomenclature places Taxodium as one species with three genotypes: T . distichum Rich. var. distichum (baldcypress-BC), T . distichum var

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Andrew R. King, Michael A. Arnold, Douglas F. Welsh, and W. Todd Watson

the cambial cells, which may lead to adventitious root formation ( Mackenzie et al., 1986 ). Zhou (2005) included a wounding treatment in a number of experiments conducted on a baldcypress clone [T302, T. distichum var. distichum × T. distichum

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southern Texas showed defoliation rates from 89% to 96% while T. distichum var. distichum from central Texas had defoliation ratings from 79% to 99%. With the exception of one family collected from the Sabinal River in Texas, the central Texas

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Genotypes Lijing Zhou* and Dave Creech; College of Forestry and Agriculture, PO Box 13000, Stephen F. Austin State University, Nacogdoches, TX 75962 Taxodium distichum (L.) Rich. var. distichum (Baldcypress, BC) and ( Taxodium X ‘Nanjing Beauty’, NB